Multipartite signaling proteins and uses thereof

a multi-component protein and signaling protein technology, applied in the field of compounding, can solve the problems of life-threatening cytokine storms associated with large numbers of activated t cells, inability to realize the full potential of t cell activation and proliferation, and inability to realize car-mediated t cell responses

Active Publication Date: 2016-10-27
2SEVENTY BIO INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In view of the limitations associated with CAR-mediated T cell responses, there is a need in the art for alternative compositions and methods useful for immunother...

Problems solved by technology

But, current CAR-mediated T cell responses do not realize the full potential of T cell activation and proliferation.
Such off-target effects could be very dangerous, particularly if the target antigen is found on other tissues, such as the heart or lung.
The cytokine storms associated with large numbers of activated T cell...

Method used

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  • Multipartite signaling proteins and uses thereof
  • Multipartite signaling proteins and uses thereof
  • Multipartite signaling proteins and uses thereof

Examples

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Effect test

example 1

Construction of DARIC Binding and Signaling Components

[0297]The DARIC binding and signaling components were each separately cloned into a plasmid vector containing a T7 promoter, a hScn or hCD8 secretion signal, respectively, and a downstream linearization site. Linearized plasmids were then used as templates for in vitro transcription reactions, followed by 3′-polyadenylation and 5′-capping steps to create mature in vitro transcribed mRNA (IVT-mRNA) to be electroporated into primary human T cells. Human T cells were isolated from PBMCs by negative selection using paramagnetic beads and expanded with anti-CD3 / anti-CD28 beads for 48 hours prior to electroporation. Control electroporations using IVT-mRNA encoding fluorescent proteins were performed in parallel to confirm transfection efficiency, or 2A protein-linked fluorescent proteins were incorporated directly into the DARIC component mRNA species.

[0298]Exemplary IVT-mRNA encoding binding components (scFv specific for CD19 and mult...

example 2

Cytotoxicity of T Cells Encoding DARIC Components

[0300]Recombinant T cells expressing the two DARIC components were incubated with K562 target cells (a human myeloid leukemia cell line), which were modified to express either CD19 or CD20 antigen, to examine target cell lysis. Briefly, T cells were co-incubated with a 50:50 mixture of K562-CD19 and K562-CD20 target cell lines, at 3:1 or 10:1 T cell to target cell ratios. In experimental samples, 500 nM final concentration of the hetero-bivalent rapalog AP21967 was added. The relative percentage of each of the target cell lines was monitored by flow cytometry staining for the CD19 and CD20 antigens to evaluate cell lysis (see FIG. 3).

[0301]Four samples of primary human T cells were prepared by electroporation with IVT-mRNA encoding (i) an extensively validated single-chain chimeric antigen receptor (CAR) (CD19-CAR, SEQ ID NO.:14, positive control); (ii) the DARIC signaling component only (DSC, SEQ ID NO.:16, negative control); iii) th...

example 3

Cytokine Secretion Profile of T Cells Encoding DARIC Components

[0304]Recombinant T cells expressing the two DARIC components were incubated with K562 target cells (a human myeloid leukemia cell line), which were modified to express either CD19 or CD20 antigen, to examine cytokine expression. Briefly, IVT-mRNA transfected T cells were co-incubated with either the K562-CD19 or K562-CD20 cell lines using T cell to target ratios of 1:1, with or without the addition of 500 nM AP21967. Supernatants were isolated for analysis of cytokine production (see FIG. 4).

[0305]Two samples of primary human T cells were isolated, expanded, and then prepared by electroporation with IVT-mRNA encoding either (i) the validated single-chain CAR (CD19-CAR, SEQ ID NO.:13, positive control); or (ii) both DARIC binding and signaling components (DSC, SEQ ID NO.: 16 plus DBC-CD19, SEQ ID NO.:2). After extensively washing the expanded and electroporated T cells to remove residual cytokines from the growth media, ...

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Abstract

The present disclosure relates to compositions and methods for using cells having chemically-induced fusion protein complexes to spatially and temporally control immune cell signal initiation and downstream responses for treating disease.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Application No. 61 / 934,092, filed Jan. 31, 2014, and U.S. Provisional Application No. 61 / 859,697, filed Jul. 29, 2013, each of which is incorporated by reference in its entirety.STATEMENT REGARDING SEQUENCE LISTING[0002]The Sequence Listing associated with this application is provided in text format in lieu of a paper copy, and is hereby incorporated by reference into the specification. The name of the text file containing the Sequence Listing is BLBD_036_02WO_ST25.txt. The text file is 433 KB, was created on Jul. 23, 2014, and is being submitted electronically via EFS-Web.BACKGROUND[0003]1. Technical Field[0004]The present disclosure relates to compositions and methods for using multi-component proteins in immunotherapy and, more particularly, using chemically induced multimerization to generate chimeric antigen receptor proteins for modulating spatial and te...

Claims

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Application Information

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IPC IPC(8): C07K16/28C12N9/12C12N15/85C12N9/90C07K14/705C07K14/725
CPCC07K16/2803C12Y502/01008C12Y207/11001C07K14/70578C07K14/7051C07K2319/03C12N9/90C12N9/12C07K2319/70C07K2317/622C12N15/85C07K14/70503C07K14/70514C07K14/70517C07K14/70521C07K14/70535C07K14/7056C12N9/003C12N9/16C07H21/04A61P29/00A61P35/00A61P37/02A61P37/06A61P43/00C12N2510/00C07K2319/00A61K35/17A61K39/0005A61K45/06C07K14/70596C07K16/2896C07K16/40
Inventor JARJOUR, JORDANASTRAKHAN, ALEXANDERCERTO, MICHAEL
Owner 2SEVENTY BIO INC
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